Converting oxazine compounds to gamma-hydroxy amines



United States PatefitC zgmnso GONWER'IING' COMPOUNDS T GAMJVIA-HYDROXY AMINES Howard D. Hartough, Wilmington, Del., and Joseph J. Dickert, Jr., West'vill'e, and Seymour L. M'ei'sel, West Dept ford Township-, Gloucester County, N. J., assignors tmSocony MobilOil Company, Inc., a corporation of New York No Drawing. Original application June 17, 1950, Serial No. 168,852; Divided and this application October 24, 1952;vSerial No. 316 7 77 3 Claims. (Cl. 260-584) In the co-pending application for United States Letters Patent Serial No; 129348 now U; S; Patent'2;647,1'1'7; filed November 29, 1949. in the names of Howard D. Hartough, Joseph J.,Dickert;,Jr; and Seymourli. Meisel, the copending application for' United- States" Letters Patent Serial No. 169;792 now'U'." S. Patent 2f;6 4711'8,- filedlune 22, 1950 in the names ofHoward DgH'artough, Joseph J. Dickert; Jr. and Seymour'L. Meisel andthe co-pending application for" United States Letters Patent Serial No; 159,126 now U. S. Patent 2,678'j3 33; filed April 29, 1950- in thenames of Howard Dr Hartough; Joseph I. Dickert, Jr. and Seymour L. Meiselj'the-aminm methylation of olefinic compounds has been described in generali'terms, with respect to obtaining increased yields of? bis.( substituted tetrahydro-1,3-oxazino) -methanes and with respect to substituting aminomethylsulfonic acids for. ammonium hydrohalid'e respectively. The present inventionris; concerned with converting the aminomethylv ationproducts, refered to hereinabove into gamma-hydroxy amines. I

It has also been discovered that'active formaldehyde can be removed from the products --of the-aminometliylation of olefinic compounds by (l), methanol and ammonium halide, (2) sulfuric acidjand (3) urea. Since the removal of activeformaldehyde from the amines by reaction with urea yields a polymeric material from which neither the formaldehyde nor the urea can be recovered it is preferred to, remove the active formaldehyde from these and similar amines by reaction with methanol and-1 ammonium halide or-sulf1iric-acid5 The reaction withmethanol yields methylal$ The foregoi'rig methods for removing active formaldehyde f'rorrr the products, of-the aminomethylationof-*olefinic' compounds are illustrated in Examples I and 11 forurea; I Examples 111 and: IV tormethanol and ammonium halide and Examples V" through VIII for sulfuricacid.

Example If 'Po about 115:parts by-weight ot the amine product. from. the aminomethylation of" isobuty1ene= were-f added about 100' parts. by weight of= concentrated hydrochloric acid andabout 60 parts by weightof urea; Thewmixture' was. heated on a steam-bath (92Y97' C.) for: about 4zhours, cooledeto: room temperature-:(20 "-'-30' C.): and then EllOW-Cdl'iO' SiklHd at :iarnbient ::temperature for about 16- hours; A urea-formaldehyde tpolymer began forming; in). theimixtureeduringxheating; The polymer; was sepe arated' andi washed with ethanol; Afterairvdrying for about l6 hours there were about 30' parts: by-weight of polymer.

Thefilt'ratewaswarmed on thea steam-bath for I about 1. hour: (to: remove the: ethanol Offlhfi' washings-:wh'i'ch hadbeen combined therewith) and; was treated?- with about. 80, parts :by weight offisodium hydroxide and :ab'olut liofparts :byvweight' of water: Thereafter,:therfiltrate was extracted; with, hob-benzene: A layerof: 0il,:,insoluble in fbothz benzeneand; water: was separated and: added to the benzene extract. The solvent WESrI'GIIlOVCd;

Patented Dec. 18, 195.6

weight. A portion of this liquid was distilled" under reduced pressure with the following. results? I U I Final, Pressure, FractlonNoi' Vapor mm; of Parts'by Temp., Hg Weight 101.- 5 45 l.- 4580 4- 101.- 5 45 I 1. 4616 5 f. 103 45 l. 4688 6 Residno I I 21 Fraction-6 formed a phenylthiourea when treated in the usual" manner with plie'nyl isothiocyanate; This derivative was recrystallized four times from abso'Z- lute ethyl acetate" and dried in a high vacuum at about 100 C. The recrystallized material melted at 117.'5' C.11'8.5 C. The recrystallized" material was analyzed with the following re'su-ltsz' Percent lereent Percent Percent 0' x N j S Calculated for CHHBNB O S Z 60:51.1" 1'56"" 11 Found 60.26 7. 52 11.

These values justify the formula:

o-oni-omNm' o a" on for the amine from which the foregoingtphenylthioiirea was derived.

Example II To about 111 parts by weight of bis-(phenyltetrahydro-1,3-oxazino)-methane were added about 72 parts by weight of" concentrated hydrochloric a c'id 'in 1 about 25 0' parts by weight of watert Thesolution Was heated to boiling and' about-bz parts byi'weight of urea were added portionwis'e. No precipitate 'of formaldeliyde-ureapoly men was n'oted until more: than half of the ure'a liad b'een addedl The urea 'formaldehyde polymer" was sep''' arated and the liquid reaction mixture was allowed to stand for about 9 days. (About 34 parts by weight of urea-formaldehyde polymer were obtained.) On the 10th day additional-'solid materialv settled out. A small.- sample of-the remainingmolution wastreatedwith aque ous sodium hydroxideand the resultant oil wasreacted in the conventional manner with phenyl isothiocyanate. The phenylthiourea thus obtained melted at 134-135 C. and when mixed with anauthentic sample of the phenylthiourea of s I ear-[gone mot-nun;

on." did not depress the nzieltingpoi-nte Example 111.

To about 85 parts by weight of the bis='(phenyl sub stitutedtetrahydro -il',3oxazino) amethane obtained from styrene were-addedr'about :pa:rts bywei ght ofwater, about 60 "parts by weight of concentratedsrhydrochloric acid and about250 partsz-by weightx 'ofmethanol. The: mixture was. agitated: at: room :temperature: (20 3 0- C; for about 1 hour; allowed ltQ-StQlldzffOP about. 16-: hoursrat: room -temperature eand then heated to reflux-temperature for-about lu'hl'; 1 I v I I methylal and excess methanol were removed from the reaction mixture by distillation (maximum temperature 100 C.). The reaction mixture was cooled and extracted with diethyl ether. Removal of. the solvent fromithis extract yielded less than 1 part by weight of benzaldehyde. The, extracted reaction mixture was treated with about 55 parts by weight of an aqueous 40% sodium hydroxide solution. The amine which separated was distilled as indicated in the following tabulation:

Pressure, mm. of Hg Parts by Fraction No. Weight Residue The melting point of Fraction 3 was 59.0-60.5 C.

After recrystallization from benzene the product melted at 59.5 61.0 C. The product was analyzed with the results presented in the following table:

Percent Percent Percent C N Calculated for GnH NO Found -'Ihe calculated values given in the table correspond to the structure This material also was formed by sulfuric acid hydrolysis of the corresponding bis-methane.

A phenylthiourea was prepared in a conventional manner from Fraction 3. After recrystallization from 95% ethanol this derivative melted at 135136 C. The phenylthiourea was analyzed with the following results:

Percent Percent Percent Percent C H N S Calculated for CmHmNaOS 67. 14 6. 33 9. 79 11.19 F d 67. 08 6. 52 10.19 11.15

Example IV To about 230 parts by weight of the crude reaction product from the aminomethylation of isobutylene were added about 200 parts by weight of Water, about 200 parts by weight of concentrated hydrochloric acid and about 600 parts by weight of methanol. The reaction mixture was stirred for about 1 hour at room temperature, allowed to stand for about 16 hours and then heated to'reflux-temperature for about 1 hour.

. The methylal, excess methanol and a part of the water were removed from the reaction mixture by distillation (maximum temperature, 110 C.). The reaction mixture was treated with about 200 parts by weight of aqueous, 40% sodium hydroxide solution, cooled to room temperature and filtered to remove the salt. The filtrate was extracted with benzene. An excess of sodium hydroxide was added to the filtrate. This caused a separation of benzene insdluble oil which was separated from the aqueous solution and added to the benzene extract;

Vapor Pressure, Fraction No. Temp., mm. nu" Parts by 0. Hg Weight The residue was a viscous brown liquid containing further distillable product. The distillation was stopped due to the exigencies of the situation.

A phenylthiourea was prepared from Fraction 2 in ac- Per- Per- Per- Percent 0 cent H cent N cent 8 Calculated for OHHIBNIOS 60. 50 7. 56 11. 76 18. 45 Found 59. 97 7. 8O 11. 96 13. 48

These calculated values correspond to the phenylthiourea derivative of an amine having the structure OQHaOHrNH: C 011 Example V About 100 parts by weight of the bis-(phenyl substituted tetrahydro-1,3-oxazino)-methane from styrene (preparation described in co-pending applications Serial Nos. 129,948 now U. S. Patent 2,647,117; 159,126 new U. S. Patent 2,678,333 and 169,792 new U. S. Patent 2,647,118) were added to a solution of about 75 parts by weight of concentrated sulfuric acid in about 375 parts by weight of water (about 10% H2S04). The odor of formaldehyde immediately was detectable. About 250 parts by weight of methanol were added to the mixture and the resultant reaction mixture warmed on a steambath (90-95 C.) for about 3 hours. Since practically all of the methanol had evaporated at this time but the odor of formaldehyde still persisted, about 25 parts by weight of ammonium chloride and about parts by weight of methanol were added to the reaction mixture and the reaction mixture was heated on a steam-bath until the methanol had evaporated. The reaction mixture was then evaporated to about 0.5 of the original volume. At this point the odor of formaldehyde was no longer detectable but there was a strong odor of hydrochloric acid. The reaction mixture was neutralized with 40% aqueous caustic and extracted with diethyl ether. The ether solution was dried over anhydrous calcium sulfate (Drierite) and the ether was evaporated. About 101 parts by weight of light yellow amine were obtained.

, This material was distilled under reduced pressure. The

The recrystallized ma- The principal constituent of Fractions 1 and 2 is -R\ OOHaNH C- RI R CH2 where R is CeHs and R, R" and R are hydrogen.

Fractions 4, 5 and 6 crystallized rapidly after seeding with crystals from Fractions 7 and 8. This material was recrystallized from benzene and dried under reduced pressure. The dried recrystallized material melted at 6l-62 C. The data of the analysis of this material is given as follows:

is justified.

A phenylthiourea was made of this material in the standard manner and recrystallized from-absolute ethanol. The recrystallized material had a melting point of 135 -135.5 C. Upon analysis the following values were obtained:

Percent Percent Percent C N Calculated for CmHrsNaOS (2)8 g1 18. 39 Emma Example VI The reaction described in Example V was repeated using the oil from which bis-(phenyl substituted tetrahydro-l,3-oxaz ino)-methane had been removed; i. e., oil from the aminomethylation of styrene in the manner described in co-pending application Serial No. 129,948 now U. S. Patent 2,647,117 from which the bis-methane had been removed. The odor of benzaldehyde was noticeable. The reaction mixture was extracted with diethyl ether before heating and about 2 parts by weight of benzaldehyde were obtained. The reaction mixture was heated on a steam-bath for about 3 hours. At this point no odor of formaldehyde was detectable. However, there was an unmistakable odor of hydrochloric acid. The material was neutralized with aqueous 40% caustic and extracted 'withdiethyl ether. The ether was--evap-. orat'ed and the amine so obtained distilled under re-'- cluce'd pressurer The data of this 'dist-illation is presented in'the following' tabulation:

Vapor Pressure; Parts Fraction No. Temp., mm: of m," by O. Hg Weight 59 0. 9 59 0. 7 1. 5257 5 74 0.25 l. 5339 6 73 0. 4 l. 5393 6 74 0. 4 1. 5412 6 76 0.4 l. 5428 6 77 0. 4 1. 5442 6. 5 75 0. 2 l. 5453 6 84 0. 5 l. 5442 6 72 0 2 1. 5459 5 92 0.5 1.5476 2.5

Residue (black; resinous,

brittle) -4 19 It is to be noted that-in'contrast to the previous example no high boiling material was obtained. Based upon the boiling points and refractive indices, Fractions 1 through 3 have as the principal constituent N-methylphenylhydroxypropylamine while the latter fractions are predominantly phenyl-substituted tetrahydro-1,'3 ox'azine'.

Example VII About parts-by weight of the amine from isobutylene, prepared in the"manner described in the copending applications to which reference has been made hereinbefore, was reacted with about 375 parts of water containing about 138 parts by weight of concentrated sulfuric acid (about 27% H2804)" as described in Exam ples V and VI. It is to be noted that no methanol nor ammonium chloride was used in this reaction.

The product after neutralization was insoluble in ether. The organic layer was drained oif and separatedfrom dissolved or entrained water by the addition of potassium-carbonate. The resultant product was dried over additionalpotassium carbonate and distilled under reduced pressure with the results given in the following tabulation:

Vapor Pressure, Parts Fraction No. Temp, mm. of m, by

C. Hg Weight 44 54 105 1. 3630 11 45 as 1. 3682 9 66 7. 5 1.4508 9 62 1. 2 1. 4580 9 82 1. 2V 1. 4746 10 94 1. 0 l. 4850 11 114 1. 1 1. 4856 6 122 1. 2 1. 4905 g Fraction 6 was found to contain 10.49% nitrogen which is indicative of the presence of materials of low nitrogen content. Such material could be dihydrie alcohols formed by the reduction of unremoved dioxanes. Any unreduced oxazine would also lower the nitrogen content of this fraction.

Fractions 6 and 7 crystallized on standing. Fraction 6 was recrystallized from benzene and dried under reduced pressure for about 16 hours. The recrystallized material had a melting point of 122-l23 C. The dried recrystallized material contained 9.29% nitrogen. A phenylthiourea, M. P. 193.5-194, was formed from this recrystallized material according to a standard procedure and was found to contain 11.22% nitrogen.

Example VIII About 100 parts by weight of crude amine from 2- methyl-l-pentene (prepared in the manner described in the co-pending applications to which reference has been made hereinbefore) was reacted with a mixture of about 375: parts by weight of .waterand about '75 parts by weight of concentrated sulfuric acid. The reaction product was much more soluble in ether than that obtained in the-previous example. The ether solution of the product was dried over potassium carbonate and the dried amine distilled under reduced pressure. Eighty-nine parts by weight of crude reaction product were obtained. A log of the distillation of the crude amine reaction product follows:

i 1 Some decomposition.

Fractions 4, 5, 6 and 7 were redistilled through a onefoot glass-packed column. The following data was obtained thereby:

Final Pressure, Fraction No. Vapor mm. of 7112 Parts by Temp., Hg Weight 40 ,1. 6 l. 4635 3 44 1. 6 l. 4614 2 70 1. 1. 4669 3 69 1. 4 l. 4778 3 75 1. 3 1. 4828 3. 5 79 1. 5 1. 4881 3 79 1. 4 1. 4873 3. 5 95 1. 3 g

'Crystallizationstarted in the column during distillation of Fraction8. The column was heated by an external source sufliciently to eliminate crystallization. After recrystallization from benzene and petroleum ether, the material of Fraction 8 had a melting point of 87-87.5

C. and had the following analysis:

Percent Percent Percent c H N Calculated for CsHnNO 67.0 11.9 9.79 Found 67.10 11.88 9.82

This application is a division of copending application,

Serial Number 168,852, now U.-S. Patent 2,652,429, filed June 17, 1950.

What is claimed is:

radicals having at least one substituent radical selected from the group consisting of lower alkyl radicals and phenyl radical and being otherwise unsubstituted into.

gamma-hydroxy amines, which comprises reacting said nitrogen-containing product with dilute aqueous mineral acid at reflux temperature, neutralizing with an aqueous solution of an alkali-metal-hydroxide, and separating the gamma-hydroxy amine from the neutralized product.

2. A method for converting a nitrogen-containing prodnot selected from the group consisting of 1,3-oxazines and bis-(1,3-0xazino)methanes at least one carbon atom of the heterocyclic nucleus of said oxazines and oxazino radicals having at least one substituent radical selected from the group consisting of lower alkyl radicals and phenyl radical and being otherwise unsubstituted into gamma-hydroxy amines, which comprises reacting said nitrogen-containing product with dilute aqueous hydrochloric acid and methanol at reflux temperature, neutralizing with dilute aqueous sodium hydroxide, and separating the gamma-hydroxy amine by distillation.

3. A method for converting a nitrogen-containing reaction product selected from the group consisting of 1,3- oxazines and bis-(l,3-oxazine)methanes at least one carbon atom of the heterocyclic nucleus of said oxazines and oxazino radicals having at least one substituent radical selected from the group consisting of lower alkyl radicals and phenyl radical and being otherwise unsubstituted into gamma-hydroxy amines, which comprises reacting said nitrogen-containing product with dilute aqueous sulfuric acid, neutralizing with aqueous sodium hydroxide, and extracting gamma-hydroxy amine with ether.

References Cited in the file of this patent UNITED STATES PATENTS 2,251,081 Taylor et a1. July 29, 1941 2,629,740 Carnes Feb. 24, 1953 2,644,013 Barth June 30, 1953 OTHER REFERENCES Groggins: Unit Processes In Org. Synthesis, (1947), 3rd ed., pp. 66941. 

1. A METHOD FOR CONVERTING A NITROGEN-CONTAINING PRODUCT SELECTED FROM THE GROUP CONSISTING OF 1,3-OXAZINES AND BIS-(1,3-OXAZINO)METHANES AT LEAST ONE CARBON ATOMS OF THE HETEROCYCLIC NUCLEUS OF SAID OXAZINES AND OXAZINO RADICALS HAVING AT LEAST ONE SUBSTITUENT RADICAL SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL RADICALS AND PHENYL RADICAL AND BEING OTHERWISE UNSUBSTITUTED INTO GAMMA-HYDROXY AMINES, WHICH COMPRISES REACTING SAID NITROGEN-CONTAINING PRODUCT WITH DILUTE AQUEOUS MINERAL ACID AT REFLUX TEMPERATURE, NEUTRALIZING WITH AN AQUEOUS SOLUTION OF AN ALKALI-METAL-HYDROXIDE, AND SEPARATING THE GAMMA-HYDROXY AMINE FROM THE NEUTRALIZED PRODUCT. 